Cofferdam structure suitable for hard geology and formed by combining cement-soil mixing piles with steel sheet piles

The utility model provides a cofferdam structure combining cement mixing piles with steel sheet piles and suitable for hard geology, which comprises a plurality of drill holes arranged on a building island, the cement mixing piles are poured in the drill holes, pull-type steel sheet piles are inserted in the cement mixing piles, and a plurality of pull-type steel sheet piles are connected to form a closed space. A supporting system for stabilizing is arranged in the closed space; the drill holes comprise a plurality of first hole sites and second hole sites which are arranged at intervals, and overlapping areas are arranged between the first hole sites and the second hole sites. The cofferdam is ingenious in structure, the use scene of the cofferdam can be expanded, the pile sinking problem of hard geology is well solved, and meanwhile the good construction effect and the quality problem are guaranteed. 本实用新型提供一种适用坚硬地质的水泥土搅拌桩结合钢板桩的围堰结构，包括设置在筑岛上的多个钻孔，钻孔内浇筑有水泥土搅拌桩，水泥土搅拌桩内插设有拉式钢板桩，多个拉式钢板桩连接形成封闭空间，封闭空间内设有用于稳固的支撑体